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Claude Haiku 5.5 vs GPT 5.3 Codex

At a glance

Anthropic's fast, low-cost Claude Haiku for high-volume work, succeeding Claude Haiku 4.5.

1M ctx$0.10/$0.50 per M

OpenAI's most advanced agentic coding model with 400K context.

87400K ctx$1.75/$14.00 per M#8/92
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper96%
Capability
Capability—
Coding
Real-World Coding—
Agentic
Terminal Tasks—Task Horizon—
Reasoning
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-10-02
Capability
CapabilityECI87.0
Coding
Real-World Coding74.8%
Agentic
Terminal Tasks78.4%Task Horizon5.8h
Specs
1M
Context
128K
Max output
Oct 2026
Released
400K
Context
128K
Max output
Feb 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input94%$0.10/M tokens
Output96%$0.50/M tokens
Cache read94%$0.01/M tokens
Cache write$0.13/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input$1.75/M tokens
Output$14.00/M tokens
Cache read$0.17/M tokens
Web search$0.01/search
Chat with Claude Haiku 5.5Go to model
Chat with GPT 5.3 CodexGo to model
Frequently Asked Questions: Claude Haiku 5.5 vs GPT 5.3 Codex▼

Which is better, Claude Haiku 5.5 or GPT 5.3 Codex?

▼

Both Claude Haiku 5.5 and GPT 5.3 Codex are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, Claude Haiku 5.5 or GPT 5.3 Codex?

▼

Claude Haiku 5.5 has a lower blended cost. Claude Haiku 5.5: $0.10 input / $0.50 output. GPT 5.3 Codex: $1.75 input / $14.00 output.

Which has a larger context window, Claude Haiku 5.5 or GPT 5.3 Codex?

▼

Claude Haiku 5.5 has a larger context window: Claude Haiku 5.5 supports 1M tokens vs GPT 5.3 Codex at 400K tokens.

Do both Claude Haiku 5.5 and GPT 5.3 Codex support vision?

▼

Yes, both Claude Haiku 5.5 and GPT 5.3 Codex support vision/image input.

What are the key differences between Claude Haiku 5.5 and GPT 5.3 Codex?

▼

Key differences: Claude Haiku 5.5 is significantly cheaper. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Claude Haiku 5.5 and GPT 5.3 Codex for free on idapt.app to see which performs better for your specific needs.

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